Checksum

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Checksum is a method of checking for errors in a communications system.
I'm Mr. Woo and my channel is all about learning - I love doing it, and I love helping others to do it too. I guess that's why I became a teacher! I hope you get something out of these videos - I upload almost every weekday, so subscribe to find out when there's something new!
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27 сен 2024

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Комментарии : 206

@Truckito2007 10 лет назад

Man, your presentation/teaching skills are spotless. I'll be watching your videos before my next presentation. Thanks

@alphamale4292 9 лет назад

Sir, you are the kind of teacher that doesn't induce the students to sleep. And there's only a few instructors that have this talent.

@sinalorululu4627 10 лет назад

couldn't be more clearer.......that was very helpful.....hands down you are a good teacher

@granceroblast 10 лет назад

Great charisma. I think you will do well as a professor or a owner of a gigantic cram school chain. I hope you will post more educational videos like this and your RU-vid channel will flourish.

@furythree 8 лет назад

this is the top google video search result now for checksum! nice work. I was surprised to see a Ruse logo to the side. Recogised the AHS and gesta non verba lol! which year did you join/start teaching? which subject do you teach? i dont remember learning checksum even in SDD

@unknwn_usr3077 7 лет назад

haha.. Im also asking the same question to myself about the subject he teaches. I think he is a mathematician. Most of his videos are math. But I would like to see more computer videos like this.. I know there are lots of video tutorials on youtube but I really find his teaching interesting and it really sticks with my brain xD

@GustavoOwned 5 лет назад

Hahah, funny. Today this guy is rocking

@MrSp3ctre 3 года назад

You're damn right about that :)

@raheemkhan2007 Год назад

Quite a famous person now :).

@RaRapidum 5 лет назад

Great video, but I really really hope that that "keyboard master race" dude in the background STOPS !

@nabeelahsan504 4 года назад

@ahmetkarakartal9563 3 года назад

hahahaha

@ShahrinRahman Год назад

😅😂

@GTexxClub 9 месяцев назад

Lmao 😂

@themightyant. 4 года назад

Knowledgeable, clear, enthusiastic and dynamic. Great teacher.

@theindiangirl9435 3 года назад

watching after 8 years of uploading, and I am finally satisfied here. -29 April 2021

@DuckieMcduck 6 лет назад

This is one implementation of Checksum however it is abstracted a bit much to make it easier on the students, hindering its purpose. It's usually done with the sum between all words in the msg like in the video, but the final value is given its one's complement and appended to the message. If the transmission is correct, repeating the procedure on the other end (except now with the appended checksum) will result in FFFF assuming 16 bit words. No division operation needs to takes place.

@ibradul 3 года назад

No clue what this is about, clicked randomly but kept watching because I was so drawn by how good your presentation skills are

@ayeshasaif7179 8 лет назад

What we have learned in Cambridge O levels is that we have to divide that sum "X" by 256 take the answer in whole number , Y. Then Z=Y*256. Then calculate the difference (X-Z). This value is checksum. example: X=11855 1. 1185/256 = 4.629 2. nearest whole number = 4 3. multiplying by 256 gives Z= Y*256=1024 4.The difference (X-Z) gives the check sum: (1185-1024)=161 5. this gives the check sum= 161 BTW I really love your lectures. :)

@gnasher5677 10 месяцев назад

I think you made a mistake in line 4

@alrineusaldore6764 4 года назад

I just subbed because of an interesting random math video, but I would have never thought that you would actually help me with stuff I needed. Thanks for the awesome video! I never understood checksum before it.

@ajaygulani3086 3 года назад

I can see why Eddie Woo is one the best teachers in Australia!

@nadas.2079 10 лет назад

This is amazing, I've learned so much in under 10 minuets what my professor was trying (and failing) to teach in an hour!! thanks a lot

@NK-iw6rq Год назад

This gentleman is a wonderful teacher

@GualbertoHinojosa94 4 года назад

Very Good Night Engineer ... One question ... You can take Checksum to a KM of a Suzuki Vehicle

@scottkennedy3071 8 лет назад

Great video, clear and easy to follow. First time I've walked away feeling good after trying to get my head around this principle.

@basavarajmsasalatti362 2 года назад

Hi Eddie, very much impressed the way you explained checksum . On databases also there is checksum not able to understand by reading . If you have anything on that can you please upload . Thanks

@tyty685 8 лет назад

Nice video, thanks for the help. The remainder for the second example is 9 (opposed to 7).

@therealdeal3042 7 лет назад

eddie would really apreciate u coming over to greenford high school and teaching it wouldbe great

@tobiasbeetz438 4 года назад

Great vid thanks! One question though: Where is advantage of using a devider instead of just comparing the sum?

@aronquemarr7434 4 года назад

If the sum exceeds 26, you cannot put it in the message.

@satellitesage2487 4 года назад

@@aronquemarr7434 I had the same question, so thank you!

@pradeepbabu7645 10 лет назад

great explanation , and i am vary glad to have a Eddie Woo in this profession u deserve that position,and i think i have to copy some teaching techniques from you .. any way thanks a lot..

@sujeetrai1553 Год назад

😂

@dragonore2009 6 лет назад

We use checksum in computer science all the time, it is an important piece in knowing if credit cards are valid for example.

@billyfairbank 8 лет назад

Great video and glad I found your channel. Obvious passion with great teaching talent.

@JohnSmithhh 2 года назад

Man you're explanation is sooo clean ! Thanks

@robertjennings5558 10 лет назад

Very well said Mr. Woo. I love your presentation style.

@ekhliousful 2 года назад

where to watch the full Video/lecture/lesson?? the links in the description are infected and not working?

@coo-kies 7 лет назад

Most fabulous and enthusiastic CS lecturer ever. Love it!

@fuego1529 8 лет назад

Thanks for uploading this video, really helped me out. You make an awesome teacher btw =)

@kristianwalsh9834 8 лет назад

Wow, this is awesome. You explained that really well. Was mesmerised by the whiteboard! Wish my Uni had them

@sodiboo 2 года назад

I remembered my classroom in like first grade had one of those. I've never really looked into it too much and as far as i can remember, this is the first time i've ever seen one since then. I didn't go to second grade at the same school since i moved.

@jasonhuang222 6 лет назад

Great explanation ! You really make things easy to understand. Thank you

@krishnangopal8614 10 лет назад

Hi Eddie.. Its really a nice video. But I have question for you. You have a data 25 11 12 13 .. initially which gives you checksum value 8. and when you changed the data to 24 12 12 13.. also gives you the same value 8. This lies under the error but still it passes the checksum value. In such case how can we ensure the data integrity?

@hankmoody666 5 лет назад

Best teacher ever.

@ArsenalNut17 8 лет назад

Great videos, taught so clearly and with great atmosphere.

@maniijuan 5 лет назад

where have your videos been my whole life (aka these past 8 weeks in my networking class lol)

@jwoodmotivation 7 лет назад

This has helped me a lot but what would the question be if it came up in an exam?

@evandiskett2512 7 лет назад

Josh Wood design a hamming code an complete a parity check. identify any flaws in check method exact words off my exam

@abdumannonmurodiy 3 года назад

Dude ur so good at teaching.

@pianoman42421 10 лет назад

You sir are an excellent teacher. Thank you very much.

@blessed5586 9 лет назад

Is this operation the same thing as a modular checksum? Thanks.

@trit2656 2 года назад

Very clear explanation. Thanks.

@sunny99179 9 лет назад

Thank you it help a lot to understande how checksum works...i appreciate so much.

@dylanmm007 11 лет назад

Thank you so much Eddie, this and the parity check video was so helpful.

@juliusballaran5150 Год назад

Man, I wish you were my teacher in college!

@pandurangathota1721 7 лет назад

very good presentation of the concept. Really i liked it.

@theone3746 6 лет назад

I love your energy.

@tarihad1145 4 месяца назад

anayone can explain me how can the 15 is the largest checksum? how can the same sum of the number send while they are different is detected?

@mbanlab 3 года назад

The model of whiteboard is giving me nostalgia.

@MarcusAurelius12 3 года назад

If the checksums match, the data was almost certainly not altered. So, why does the checksum or CRC by itself not provide security?

@Adam_Bell32 9 лет назад

love your videos so helpful but how is the divisor chosen

@AlexanderBollbach 6 лет назад

a larger divisor means that the sum of the message can have more possible remainders. only one remainder can be correct. so more remainders means more chances the checksum could be wrong. which means less chance it can be right. so the larger divider the more secure the check is?

@Deshammanideep 6 лет назад

you explained well...!

@cook7772 9 лет назад

I'm confused. I learned checksum to add al the numbers then flip the bits (add one depending if I'm using ones or two complementary addition.) then you add that the end of the message. The reserver adds it up and should get 0 if right. This looks like a mix of checksum (the one I learned) and CRC. So I'm confused.

@tsp8855 9 лет назад

+cook7772 I think the ones complement and two's complement thing is exclusively for dealing with negative numbers, while checksum's main goal is to provide data integrity.

@roxas2442 8 лет назад

Wohoooo your vids helped our class alot thanks heaps mista woooohooooo!

@fizloki 6 лет назад

That whiteboard setup is sliccccckkkkkk

@karlreimers 2 года назад

Very nicely explained-

@ebtihalm9368 11 лет назад

Thank you so much , It helps me a lot to understand checksum in NW , Keep going :)

@makharsa12 6 лет назад

Thank you for such great channel

@nicolechung6805 8 лет назад

you are awesomeee! such clear explanation that I wish you're my lecturer xD

@charlesporsbjer2416 19 дней назад

Wish I had this teacher in school.

@multiSPEEDitUP 6 лет назад

dude, that was great.....ez.... no bs. clear. have an upvote.

@ShahrinRahman Год назад

Explained it well. ❤

@talinbajaj9370 9 лет назад

Why is a bigger divisor preffered when the chances of the data being sent wrong are more? Please help me Eddy Woo

@denveruhl1390 3 года назад

How can the remainder be 8, when 72 (sun) : 16 (checksum) = 4.5 and not 8?

@JosQiNgMT 3 года назад

i love u. clear and easy to the spot

@inadaizz 3 года назад

Thank you professor Woo!

@inadaizz 3 года назад

And as we discuss parity / checksums I cannot help but notice this is uploaded to a "eddie woo" channel.... but the professor appears to be one James Ruse -> huh. So thanks to both of you or one of you with an alias... or something.

@jcp411 3 года назад

@@inadaizz Where do you find he's Professor James Ruse? He did teach at James Ruse Agricultural High School per Wikipedia. Also this might provide more insight. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-30j8e7PZXgI.html

@inadaizz 3 года назад

Well observed.

@AayushChitnis 2 года назад

4:55 that kid who is typing in background is definitely playing fortnite lol he grinding with his 10000 dollar pc at school lol 😂

@everlynemutua1877 6 лет назад

good teacher i like your teaching skills

@chaitanyanarayan7004 8 лет назад

HOLY JAMES RUSE. THE DREAM!!!!

@skrt3355 Год назад

very well explained video

@Geadalu 8 лет назад

You're incredible, oh my gosh! :O You're really really good at teaching! *____*

@ajayguhan 6 лет назад

Wow, superb teaching..!

@samirsmairat3070 10 лет назад

thanks alot but i wonder if you can introduuce more examples

@harithsiddiqui2643 8 лет назад

Amazing.

@HumbleHistorian 5 лет назад

you teach awesome !

@RohanShah05 11 лет назад

Great work man... Thanks a ton... This surely helped...

@GualbertoHinojosa94 4 года назад

Una pregunta ... Estoy tratando de desepcritar un Checksum de un Algoritmo ... De Un Suzuki Dzire 2018 ... El vehículo tiene 35000 km Se hace así ... Dec * 100 a HEX ... 35000 * 100 = 0035 67E0 = 3500 E067 Checksum = 832F F61D ... ese Checksum

@frankvermeeren79 Год назад

Great intro!

@scottsourile4723 3 года назад

Helpful video! Sidenote: anyone else think the instructor, Mr. Eddie Woo, has a David Tennent, 10th Doctor (Doctor Who) vibe going on about him?

@ABDULLAHAIi 9 лет назад

I like the way you explain .. I got it right a way .. BIG like + subscribe .. I can't wait to watch the rest of your videos .. keep it up

@florence7722 10 лет назад

Really Good, thanksEddie

@Jimakos1998 6 лет назад

great video

@gurdeepmundi6440 7 лет назад

could not be better than that. That was great.

@lokendrapuri5376 8 лет назад

like your way of teaching....

@ahmetkarakartal9563 3 года назад

thanks , great video

@TonyStark-of7tq 7 лет назад

Thanks!!! Helped me a lot!!

@snake1625b 4 года назад

whats the point of dividing it? why not just use the original sum

@yuzhixiao8809 9 лет назад

This is very nice! thank you!

@dennishughes8579 Год назад

Sky Communications Absolutely

@JjackFrost 6 лет назад

Saved me. Thank you so much

@IcyWasTakenAgain 10 лет назад

thank you , i understood the checksum with this one :D thanks alot

@andrewirwin3365 10 лет назад

***** Great tutorials! really enjoying them and learning alot! but can you make them longer please. you should teach on Khan academy because you are good enough. Thank you From Ireland!